JPH0140600Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a die that performs terminal forming processing to impart holding force to the connecting end of a flat cable after it is inserted into a mounting hole of a printed circuit board. It is something.

(Prior Art) As shown in FIG. 5, this type of flat cable 1 is constructed by arranging a plurality of insulated wires in parallel and bonding the insulating sheaths 2 of each adjacent wire to each other to form an integrated cable. The flat cable 1 is often used as a jumper wire in a printed circuit board or for interconnecting circuit boards. At the connection end of the flat cable 1, the insulating coating 2 is stripped and each protruding core wire 3 is inserted into each mounting hole 5 drilled in the printed circuit board 4, and then fixed by soldering or the like. be done. Then, a forming process is performed to provide a holding force so that the inserted core wire 3 does not easily escape from the mounting hole 5 before soldering. The forming process is performed, for example, as shown in FIG. 6, by using an upper die 6 having a valley-shaped shaped surface formed on its end surface, and a lower die 7 paired with this having a valley-shaped shaped surface formed on its end surface. 3 was pressed and clamped, and all the core wires 3 were bent in one direction.

(Problems to be Solved by the Invention) However, according to the above-mentioned conventional technology, the holding force is weak because the bending is done in one direction, and as shown in FIG. The core wire 3 tends to fall down as shown in Figure 7b. Also,
After tilting it to the left side as shown in Fig. 7c, Fig. 7d
If you pull it out by tilting it to the right as shown in the figure, it will be pulled in the direction along the forming shape, and it will come out extremely easily.

In particular, during work, the printed circuit board 4 is often tilted or turned over, and if each core wire 3 of the flat cable 1 escapes from the mounting hole 5 at this time, work efficiency will be significantly reduced, and a highly reliable connection will not be possible. is not obtained.

Therefore, the applicant of this case first proposed the following forming structure to improve these drawbacks. This forming structure is the eighth
As shown in the figure, adjacent core wires of the flat cable 8 are bent alternately into a mountain shape and a valley shape, and are arranged to face each other.

That is, for example, each of the odd-numbered core wires 9 is formed into a mountain shape, and each of the even-numbered core wires 10 is formed into a valley shape. As a result, when the core wire 9 is inserted into each mounting hole 12 of the printed circuit board 11 as shown in FIG.
0 presses the other edge opposite to this, so it stands upright without tilting and provides a strong holding force.

Therefore, an object of the present invention is to provide an inexpensive die that can easily form the forming structure.

(Means for Solving the Problems) The dice of the present invention have first
and one die formed by a second die member,
It is composed of a pair of dies, the other being made up of third and fourth die members that are combined with each other.
Each of the die members has a plurality of protruding pieces protruding at predetermined intervals and respective notch grooves provided on the face plate between the protruding pieces, and each protruding piece is formed on the side of the mating die member to be assembled. It is fitted into each notch groove and assembled in a shape of palms together. The end faces of the protruding pieces of the die members to be combined are different from each other (for example, the first and third die members have male protruding pieces with a chevron shaped surface, and the second and fourth die members have male protruding pieces with a chevron shaped surface. (In this case, we will use a female-shaped protrusion piece with a valley-shaped modeling surface.) When these are assembled, each die will have its mountain-shaped and valley-shaped shaping surfaces alternately arranged adjacent to each other. The molding surface of one die and the molding surface of the other die are both arranged so that the ridges and troughs face each other and engage with each other.

Therefore, when each core wire of the flat cable is sandwiched and pressed between the pair of dies, a terminal forming process is obtained in which adjacent core wires alternately form peaks and valleys.

(Example) An example of the present invention will be described below based on the drawings. FIG. 1 shows a pair of dies for forming the end of a flat cable. The upper die 13 is composed of a combination of a first die member 14 and a second die member 15, and the lower die 16 is a combination of a first die member 14 and a second die member 15. It is configured by a combination of a third die member 17 and a fourth die member 18. The first die member 14 has a plurality of projecting pieces protruding from the lower end of the vertical face plate toward the second die member at predetermined intervals, and the lower end surface of the projecting pieces forms a chevron-shaped modeling surface. This is a male protrusion piece 19.

A notch groove 20 is provided in the vertical face plate between each of the male protrusions 19, and a through hole 21 is bored in the upper face plate of the notch groove 20.

Further, the second die member 15 has a plurality of projecting pieces projecting from the lower end of the vertical face plate toward the first die member 14 at predetermined intervals, and the lower end surface of the projecting pieces is a valley-shaped modeling surface. This is a female-shaped protrusion piece 22 formed with. A notch groove 23 is provided at the lower end of the vertical face plate between each of the female protrusions 22, and a through hole 24 is bored above the notch groove 23.

When the vertical face plates of the first die member 14 and the second die member 15 are brought into contact with each other, each male protrusion piece 19 of the first die member 14 is inserted into the cutout groove 23 of the second die member 15. and each female protrusion piece 22 of the second die member 15 fits into the notch groove 20 of the first die member 14 and is assembled in a shape of palms together, opening the through hole 21 and the through hole 24. Inserted bolt 2
5 and nuts 26 to be assembled to the integral upper die 13. Since the male projection pieces 19 and the female projection pieces 22 are arranged adjacent to each other alternately, the upper die 13 has mountain-shaped and valley-shaped modeling surfaces alternately formed.

Next, the third die member 17 has a plurality of projecting pieces projecting from the upper end of the vertical face plate toward the fourth die member 18 at predetermined intervals, and the projecting pieces have the male-shaped projections on the upper end surface. This is a male protrusion piece 27 that has a chevron shaped surface similar to the piece 19. However, the arrangement of the male protrusion pieces 27 is provided at a positional interval that matches the arrangement of the female protrusion pieces 22 provided on the second die member 15, so that the male protrusion pieces 27 and the female protrusion pieces 22 As will be described later, when the lower die 16 and the upper die 13 are respectively formed, they are arranged to face each other so as to engage with each other.

A notch groove 28 is provided in the vertical face plate between each of the female protrusions 27, and a through hole 29 is bored in the lower face plate of the notch groove 28.

Further, the fourth die member 18 has a plurality of protrusions drilled at predetermined intervals from the upper end of the vertical face plate toward the third die member 17, and the female protrusions are formed on the upper end surface of the fourth die member 18. This is a female-shaped projection piece 30 that has a valley-shaped shaped surface similar to 22. However, the arrangement of the female projection pieces 30 is provided at a position interval that matches the arrangement of the male projection pieces 19 provided on the first die member 14, and the male projection pieces 30 and the male projection pieces 19 are arranged at intervals that match the arrangement of the male projection pieces 19 provided on the first die member 14. As will be described later, when the lower die 16 and the upper die 13 are respectively formed, they are arranged to face each other so as to engage with each other.

A notch groove 31 is provided in the vertical face plate between each of the female protrusions 27, and a through hole 32 is bored in the lower face plate of the notch groove 31.

When the vertical face plates of the third die member 17 and the fourth die member 18 are brought into contact with each other, each male protrusion piece 27 of the third die member 17 engages with the cutout groove 31 of the fourth die member 18. The female protrusions 30 of the fourth die member 18 fit into the notch grooves 28 of the third die member 17 and are assembled in a shape of palms together, so that the through holes 29 and 32 It is assembled to the integral lower die 16 with bolts 33 and nuts 34 inserted through the lower die 16.

This lower die 16 also has the same characteristics as the die described above.
Since the male-shaped projection pieces 27 and the female-shaped projection pieces 30 are arranged adjacent to each other alternately, mountain-shaped and valley-shaped modeling surfaces are formed alternately.

The upper die 13 and the lower die 16 configured in this way are both arranged with the chevron-shaped forming surface and each shape forming surface facing each other, so that they engage with each other. .

Between the upper die 13 and the lower die 16,
When each of the core wires 9 and 10 arranged in parallel at the terminal of the flat cable 8 is held and pressed, the core wire 9 forms the valley-shaped shaped surface as shown in FIG.
The female protrusion piece 22 of the die member 15 is bent into a chevron shape by the engagement with the male protrusion piece 27 of the third die member 17, which forms a chevron shaped surface, and the core wire 10 is bent into a chevron shape. The male protrusion piece 19 of the first die member 14, which formed a modeling surface, is engaged with the female protrusion piece 30 of the fourth die member 18, which formed a valley-shaped modeling surface, thereby forming a valley shape. folded, 8th
Forming is performed alternately into mountain and valley shapes as shown in the figure.

(Effect of the invention) As is clear from the above embodiments, according to the die of the invention, it is possible to perform forming processing of alternating mountain-shaped and valley-shaped bends at the same time for each terminal core wire installed in parallel of a flat cable. Therefore, when the end of the flat cable is inserted into the mounting hole of the printed circuit board, it can be held upright and a strong holding force can be applied.

This forming process is extremely simple, similar to the conventional forming process, and is inexpensive because each of the pair of dies is composed of a simple combination of die members.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view of an upper die and a lower die according to an embodiment of the present invention, Fig. 2 is an exploded perspective view of the upper die, Fig. 3 is an exploded perspective view of the lower die, and Fig. 4 is an exploded perspective view of the upper die. The figure is a partial cross-sectional view showing the forming process using the same die, FIG. 5 is a perspective view illustrating the usage condition of a conventional forming-processed flat cable, and FIG. 6 is a partial cross-sectional view showing the same forming process. Figure 7 is a partial longitudinal sectional view showing the flat cable in its inserted and pulled out states;
The figure is a perspective view of a main part of a flat cable formed by the die of the present invention, and FIG. 9 is a partial vertical sectional view of the same flat cable in an inserted state. Explanation of symbols, 8... Flat cable, 9, 1
0...Core wire, 11...Printed circuit board, 12...Mounting hole, 13...Upper die, 14...First die member, 15...Second die member, 16...Lower die, 17 ...Third die member, 18...
Fourth die member, 19, 27...male projection piece,
22, 30... Female projection piece, 20, 23, 28,
31...Notch groove.

Claims (1)

[Claims for Utility Model Registration] Consisting of a pair of dies, one die is composed of first and second die members that are combined with each other, and the other die is composed of third and fourth die members that are combined with each other. A plurality of protrusions are provided at predetermined intervals at the ends of each of the die members, each protruding toward the other die member to be combined, and a face plate between the protrusions is provided with a plurality of protrusions at predetermined intervals. A cutout groove is provided in which each of the protrusions on the side of the dice members to be combined is fitted, and one of the first and second die members and one of the third and fourth die members is provided. In each of the die members, the protruding piece is a male protruding piece whose end face is formed into a chevron-shaped forming surface, and in each die member to be combined with this, the protruding piece has an end face formed into a valley-shaped forming surface. A female-shaped protruding piece formed with one die, which is assembled by fitting the protruding pieces and notch grooves of the first and second die members in a palms-in position, and the third and fourth die members. The other die, which is assembled by fitting the protrusions of the die member and the cutout grooves in a palm-like manner, has mountain-shaped and valley-shaped shaping surfaces alternately arranged adjacent to each other, and is similar to the one die. The chevron shaped surfaces of the other die are arranged to face each other so as to engage with the valley shaped surfaces of the other die, and the valley shaped surfaces of one die are respectively engaged with the chevron shaped surfaces of the other die; A die characterized in that each core wire of a flat cable is pressed and clamped between the dies so that forming processes are performed alternately into mountain and valley shapes.